I'm gonna go out on a limb and say Lady Gaga. Her days of being the quirky pop star that everyone pays attention to are done. Her act isn't shocking or interesting anymore, plus she can't even sell out stadiums, as her current tour is proving. She will always have a dedicated fan base no matter what, but as far as the general public is concerned, she's a has-been.
I love her music and I hope I end up being wrong about the above, but I don't see her career lasting even half as long as Madonna's.
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